A solution containing 2.675 g of `CoCl_(3)`. 6 `NH_(3)` (molar mass = 267.5 g `"mol"^(-1)`) is passed through a cation exchanger. The chloride ions obtained in solution were treated with excess of `AgNO_(3)` to give 4.78 g of AgCl (molar mass = 143.5 g `"mol"^(-1)`). The formula of the complex is (At. Mass of Ag = 108 u)
A. `[Co(NH_(3))_(6)]Cl_(3)`
B. `[CoCl_(2)(NH_(3))_(4)]Cl`
C. `[CoCl(NH_(3))_(3)]Cl_(3)`
D. `[CoCl(NH_(3))_(5)]Cl_(2)`